When all else fails, when the weapon systems are offline, when the computer is dead, when the engine is half-crippled, as long as
you can move at all, you can still heave about and crash into your opponent.

In fact, even if your vehicle is totally immobile, a suitably clever player will still find a way to ram it into an enemy vessel.

Transcript

R2-D2: All right, if we don't have thermal fusion shock-lances, I'll just use metal-eating nanite bombs with our mass-driver.GM: You don't have those either.R2-D2: Gravity wave implosion field?GM: Nope.R2-D2: Zero-point energy inverter beam?GM: I don't think so.R2-D2: Allotropic iron torpedoes?GM: Let me check....GM: No.R2-D2: How about a trebuchet?GM: You have laser cannons.R2-D2: Okay, I can work with that. It's not the power of the weapon, it's what you do with it. Firing pattern: Delta!GM: Roll.R2-D2: 1. Well that's the last daylight that die will ever see.GM: You missed everything in the entire battle.Obi-Wan: What are the odds of that, R2?
{beat}
{beat}R2-D2:Ramming speed.